Has anyone an idea where can i get the 48v from the original spindle

Has anyone an idea where can i get the 48v from the original spindle controller @ the controller box of the cnc3040? Or someone has the schematic of this spindle controller?

This one looks like the one I bought with my 400W spindle: http://www.ebay.co.uk/itm/221412959464

@sszafran no i mean the pins on the original spindle control board where i can get 48v?

http://www.mycncuk.com/attachment.php?attachmentid=11836&d=1394669912
Folow the reticfier bridge connected to 38VAC

One point will be on one of tyhe pins of IRF740 that is conneted to the + of the bridge, the other will be on the - of the bridge